Sequential zone picking is an order picking method designed to enhance warehouse efficiency by dividing the storage area into multiple zones and picking items in a sequential order across these zones. Picked items are often placed in dedicated totes and transported between zones using a conveyor system, which manages the picking flow but can occasionally result in inefficiencies during the process. This study presents a variant of the sequential zone picking system, called a dual-lane zone picking system (DZP), which consists of two parallel conveyor lanes without buffers between consecutive zones. This conveyor configuration allows the picker in each zone to alternate processing between the two lanes, thereby lessening the constraints of tote transitions between zones and improving both system throughput and picker utilization. We design and conduct a series of experiments using a discrete-event simulation model to evaluate the performance of DZPs. The experiment results indicate that DZP surpasses the original single-lane zone picking system by shortening the system’s mean flow time in low flow intensity scenarios and achieving a higher maximum throughput and worker utilization in high flow intensity scenarios. Additionally, we investigate the effects of the number of zones and order batching size on the performance of DZP to gain further insights into the system’s operational control.

해운 산업은 탄소 배출 저감을 위한 다양한 기술적 해결책을 모색하고 있으며, 그중 암모니아(NH3)는 차세대 무탄소 연료로 각 광받고 있다. 암모니아는 이산화탄소(CO2)를 배출하지 않으며, 기존 인프라를 활용해 대규모 운송 및 저장이 가능하다는 장점이 있다. 본 연구는 암모니아를 수소(H2)로 개질하여 연료전지에 공급하고, 이를 통해 전력을 생산하는 하이브리드 전기 추진 시스템의 성능을 평가하 였다. 암모니아-수소 개질기, 수소 연료전지, 배터리로 구성된 이 시스템은 친환경적인 추진 방식이다. 경사 시험(Heel test)은 선박이 실제 항해 중에 겪을 수 있는 10도 경사 상황에서 시스템이 안정적으로 작동하는 평가하기 위해 수행되었다. 시험 결과, 암모니아 개질기는 경사 조건에서도 안정적으로 수소를 생산하였다. 연료전지와 배터리가 결합된 하이브리드 시스템은 부하 변동 상황에서도 효율적으로 전력을 관리하고 안정적인 전력 공급을 유지했다. 특히 경사 상태에서도 시스템 성능 저하 없이 연료전지와 배터리 전력, 전류, 전압의 상호작용이 원활하게 이루어졌음을 확인할 수 있다. 본 연구는 향후 친환경 선박의 핵심 기술로 자리 잡을 수 있는 암모니아 기반 추진 시스템의 안정 성과 성능을 실험적으로 검증하였다는 점에서 그 의미가 있으며, 따라서 본 연구 결과는 해운 산업에서 암모니아 기반 추진 시스템의 사용 화 가능성을 높이는 중요한 기초 자료를 제공할 것으로 기대된다.

PURPOSES : The number of snowfall and the amount of snowfall are gradually increasing, and due to the characteristics of Seoul, which has a lot of traffic, it is difficult to respond quickly with a snow removal method that relies on snow removal vehicles. Therefore, it is necessary to develop an IoT based eco-friendly snow removal system that can respond to unexpected heavy snow in winter. In this study, the low temperature operation and snow removal performance of the IoT road condition snow removal detector and the snow removal system using CNT and PCM are evaluated in the climatic environment chamber. METHODS : To make artificial snow, it consists of an climatic environment chamber that can simulate a low temperature environment and equipment that can supply compressed air and cold water. Depending on the usage characteristics of the climatic environment chamber, use an air-water type snow maker. In order to make artificial snow, wet temperature, which takes into account the actual air temperature and the amount of moisture in the air, acts as the most important variable and is suitable for making snow, below –1.5 ℃. The lower the water temperature, the easier it is to freeze, so the water source was continuously supplied at 0 ℃ to 4 ℃. One of the two different pipes is connected to the water tank to supply water, and the other pipe is connected to the compressor to supply high-pressure air. Water is dispersed by compressed air in the form of many small droplets. The sprayed microscopic water particles freeze quickly in the low temperature environmental climatic chamber air and naturally fall to the floor, forming snow. Based on the KS C IEC 60068-2-1 cold resistance test standard, an integrated environmental test procedure was prepared to apply to IoT-based snow removal systems and performance evaluation was performed accordingly. The IoT based eco-friendly snow removal system is needed to in winter, so visual check and inspect the operation at the climatic chamber before setting up it to the actual site. In addition, grid type equipment was manufactured for consistent and reliable snow removal performance evaluation under controlled environmental conditions. RESULTS : The IoT-based eco-friendly snow removal system normally carried out the task of acquiring data and images without damaging the appearance or freezing in a low temperature environment. It showed clear snow removal performance in areas where PCM and CNT heating technology were applied to the concrete slab. This experiment shows that normal snow removal tasks can be carried out in low temperature environments in winter. CONCLUSIONS : The integrated environmental test procedures and grid type evaluation equipment are applied to low temperature operation and snow removal performance evaluation of snow removal systems. In the climatic environment chamber, where low temperature environments can be simulated, artificial snow is created regardless of the season to derive quantitative experimental results on snow removal performance. PCM and CNT heating technology showed high snow removal performance. The system is expected to be applied to road site situations to preemptively respond to unexpected heavy snow in winter.

This study was conducted to evaluate the effects of ImmunoSEB as an immune-booster additive on the performance of broiler chicks. A total of 1150 broiler chickens were randomly allotted to three treatments on the basis of body weight (10 pens per treatment with 40 broilers in each pen): the control (CON), CON + ImmunoSEB 0.025% in feed (SEB25), and CON + ImmunoSEB 0.050% in feed (SEB50). The experiment was conducted for d 42 in three phases (phase 1, d 0–14; phase 2, d 15–28; and phase 3, d 29–42). There were significant differences in the average daily gain (ADG) and feed intake. The ADG at d 14 in the SEB50 treatment was greater than that in the CON treatment. The overall ADG in the SEB50 treatment was greater than that in the CON treatment. During d 0–14, the feed intake of chickens in the SEB50 treatment increased compared to that in the CON treatment. The crude protein and lysine digestibility improved in the SEB25 and SEB50 treatments compared to those in the CON treatment at d 28. Superoxide dismutase concentration significantly increased in the SEB50 treatment compared to that in the CON treatment. The interleukin-1β and tumor necrosis factor-α concentrations were higher in the cecum of chickens in the CON treatment than in the SEB25 and SEB50 treatments. A lower population of E. coli was detected in the ileum and cecum of broilers fed the SEB50 diet compared to those of broilers fed the CON diet. The overall result showed the beneficial effects of using ImmunoSEB at a dose of 0.050% in broiler chickens.

A telesounder is a device that can monitor the appearance of fish in the sea on land and store fish detection data. This study was conducted to monitor the appearance of fish resources in coastal or near seas by using LTE communication for data transmission of the telesounder. The purpose of this study was to develop a prototype telesounder that can monitor the appearance of fish groups in the waters about 50 km away from the coast and store fish detection data. In this study, the prototype telesounder including a fish finder, communication device and battery for stable operation at sea was developed. The stability of telesounder buoy, data transmission/reception and expected use time were investigated. The expected use time of the telesounder using LTE communication with a lithium battery (12 V, 120 Ah) was about 274 hours under the conditions of 10 minutes off and 10 minutes on, about 520 hours under the conditions of 30 minutes off and 10 minutes on, and about 142 hours under continuous conditions. As a result of the sea test, it was found that the telesounder can be used in the sea area moved about 34 km from the land and the telesounder buoy was evaluated to have secured basic stability (buoyancy balance, waterproof, antenna strength, etc.) for operation in a marine environment.

위험유해물질(HNS, Hazardous and Noxious Substances)은 해상운송 과정에서 다양한 사고에 노출되어 있어 많은 양이 바다에 유출 될 우려가 있다. HNS 유출에 따른 해양환경의 손상은 유류 유출에 의한 손상보다도 훨씬 큰 것으로 알려져 있다. 특히 해저로 침강하여 침적되는 HNS는 해저생태계에 돌이키기 어려운 피해를 주게 되므로, 반드시 회수되어야 한다. 해저로부터 HNS를 회수하기 위해서는 해저침적 HNS에 대한 정확한 탐지, 안정화 처리 및 회수를 위한 절차와 장비가 필요하다. 그 중에서도 기계적 회수장치를 개발하기 위해서는 성능지표를 이용하여 성능요건을 선정하고, 이를 토대로 기계적 회수장치에 대한 개념설계가 이루어져야 한다. 따라서 본 연구에서는 해저침적 HNS의 회수 절차에서 요구되는 기계적 회수장치에 대한 개념설계안을 제시하였다. 개념설계안으로 해저침적 HNS를 회수하기 위한 기본 시나리오를 제시하고, 자체적 밀폐 성능을 가지는 흡인 기초를 활용하는 방안을 채택하였다. 기계적 회수장치는 흡인 기초, 오 염 방지, 펌프 시스템, 제어 시스템, 모니터링 장비, 위치정보 장비, 이송 장비, 탱크로 구성된다. 이러한 개념설계안은 기계적 회수장치의 부품 및 형상을 결정하는 기본설계에 반영되어 활용될 것으로 기대된다.

Vietnam is a developing country with impressive economic achievements in recent years. Efficient logistics system is considered the key to success of Vietnam’s development, especially when its economy relies on import, export and foreign investment. Since 2007, Logistics Performance Index (LPI) issued by the World Bank has been used as a trustworthy signal for the condition of a country’s logistics system. In 2018, Vietnam’s LPI shows a spectacular improvement by increasing 25 ranks and stands at the 39th position in the global ranking. It is also the best position for a lower-middle income economy in the ranking. The paper aims to reveal the current situation of Vietnam’s Logistics system behind this remarkable increase of the LPI ranking. Both the statistical and empirical analyses will be applied to answer the proposed Hypothesis and Sub-Questions for better understanding on Vietnam’s LPI. It is concluded that despite of a sudden rise in the LPI results, Vietnam’s logistics system has not shown a significant improvement. In order to maintain the LPI rank in the top 50 in the world, Vietnam needs to continue making efforts to develop synchronous logistics system to gradually solve current problems.

A connected control method for the adjacent buildings has been studied to reduce dynamic responses. In these studies, seismic loads were generally used as an excitation. Recently, multi-hazards loads including earthquake and strong wind loads are employed to investigate control performance of various control systems. Accordingly, strong wind load as well as earthquake load was adopted to evaluate control performance of adaptive smart coupling control system against multi-hazard. To this end, an artificial seismic load in the region of strong seismicity and an artificial wind load in the region of strong winds were generated for control performance evaluation of the coupling control system. Artificial seismic and wind excitations were made by SIMQKE and Kaimal spectrum based on ASCE 7-10. As example buildings, two 20-story and 12-story adjacent buildings were used. An MR (magnetorheological) damper was used as an adaptive smart control device to connect adjacent two buildings. In oder to present nonlinear dynamic behavior of MR damper, Bouc-Wen model was employed in this study. After parametric studies on MR damper capacity, optimal command voltages for MR damper on each seismic and wind loads were investigated. Based on numerical analyses, it was shown that the adaptive smart coupling control system proposed in this study can provide very good control performance for Multi-hazards.

본 논문에서 온라인 쇼핑몰에 적용을 목적으로 2차원 이미지에 기반한 가상 의상 착용 알고리즘을 설계하고 개발하였다. 기존의 가상착용 시스템은 3차원 의상 및 사용자 정보에 기반하여 비용과 시간이 많이 들어가는 문제를 가지고 있다. 본 시스템은 최근 급격히 발전된 딥러닝기술과 컴퓨터 그래픽스 기술을 활용한다. 우선, 패션영상을 시멘틱 분할 네트워크를 사용하여 옷과 신체를 영상분할하고, 자세 네트워크를 사용하여 의상과 사용자의 골격정보를 확보한다. 이 두 가지 정보를 바탕으로 의상의 골격위치와 사용자의 골격위치를 일치시킴으로서 변형에 필요한 변수를 확보하고 이를 바탕으로 영상 변형을 하여 가상착용을 수행한다. 실험결과 단순한 기하형태의 옷과 선 자세를 유지하는 패션사진과 사용자사진의 경우 만족스러운 변형 결과를 얻을 수 있었으나 다양한 의상의 형태나 자세를 갖는 경우 원만한 착용결과를 얻을 수 없었다. 완벽한 시스템은 존재할 수 없으므로 현재 기술로 적용 가능한 의상의 범위와 문제 상황을 자세히 분석하여. 이를 바탕으로 추후 연구를 방향을 설정할 수 있도록 하였다.

This paper considers a paternity and kinship analysis system(PKAS) being currently used in real sites. A knowledge-based expert system is proposed to improve the performance of PKAS in terms of accuracy, speed, training time, and satisfaction, which are common measures for evaluation. The knowledge base, one of the most important components in the knowledge-based expert system(KBES), consists of a rule made from random matching algorithm, decision rules of allele types and guide rules of options. The last two rules are learning incrementally from sample data. The results show that PKAS armed with the expert system ensures the better performance with regard to these criteria than the existing system. Especially as far as speed is concerned, as the sample size increases, it outperforms the existing one. As the number of samples increases, while processing time increases nearly exponentially in the existing PKAS, it does linearly in our proposed system.

This study investigated the embedded depth of guardrail posts through 3-D soil material model and carried out evaluation of the dynamic performance of guard rail. In order to calculate for embedded depth of sloping ground, displacement of guardrail posts is analyzed according to the embedded depth of experiment variables. Through the static test of guardrail posts, the maximum deflection was found to decrease the interval. By performing the dynamic test using the Bogie Car, that is confirmed the elastic modulus of the soil occuring the maximum deflection. Guardrail posts is considered to need for further reinforcement in the larger slope than the plains. This study researched about maximum displacement and deviation velocity through dynamic performance of guardrail system and conducted analysis about protection performance evaluation of passenger.

This study is aimed comparative analysis for business performance of land-based ezo abalone (Haliotis discus hannai) seed farms by standardizing cost structures by region and farming size. The result of survey on average farming incomes by region showed that farming incomes in Haenam and Jindo regions were much higher than those in other regions. Followed by Wando region, incomes in other regions were analyzed to be relatively lower. It is shown that farming incomes became higher as farm size increased. Farming incomes per unit size which were modified from farming incomes by region were highest in Jindo region, followed by East sea region, Wando and Haenam regions. Incomes in Jeju and Yeosu regions were analyzed to be relatively lower. Results on farming incomes per unit size (m2) showed that both farming incomes and profits became higher as size increased. It implies that a scale effectiveness might exist in case of land-based abalone culture system. Impacts of major factors on farming profits and returns on investment in abalone seed aquaculture are summarized as follow. First, only if the survival rate increased by 10% with improvement of component ratio, variable effects became largest. In variable effects of other factors, a variation in Jindo region was largest and on the other hand, a variation in Yeosu region was shown to be smallest.

Plant management have a greatest influence on the corporate variety of tasks such as production, quality, environment. So, various performance indices for plant management are operating. But plant management tasks can be carried out effectively, so that all of how to organize and efficiently manage indicators is lacking real condition In this paper, improved profitability, cost savings by applying the concept for the performance assessment, plant management services, such as the key indices for performance according to the objectives of the firm. Dashboard for plant management work using me to develop a system that manage.

PURPOSES: This paper evaluates, using LS/DYNA-3D software, the vehicle impact performance of flexible barriers made of steel WBeam supported by four different types of post configurations. These types include circular post, H-shape post, C-shape post, and square post. METHODS : The post-soil interaction has been investigated according to different impact angles. For this purpose, energy absorption, maximum displacements of post and rail, and occupant risk index of THIV have been compared each other. The three dimensional soil material model, instead of the conventional spring model based on Winkler and p-y curve, has been used to increase the correctness of computational model. RESULTS: It is noted the crash energy absorption has been increased with respect to the increase of impact angle. CONCLUSIONS : In particular, a post with open section(H-shape, C-shape) shows the greater crash energy absorption capability as compared with a post with closed section under the same level of impact conditions.

풍진동에 의한 사용성의 문제를 해결하고 진동을 저감시키기 위하여 TLCD가 설치된 건물의 태풍에 의한 풍진동 계측결과를 바탕으로 시스템식별을 통하여 동특성 및 모달풍하중을 추정하고 TLCD의 풍진동 저감성능을 분석하였다. 대상건물은 인천 송도에 위치한 지상 64층 237m의 주거용건물로 상층부에 TLCD가 설치되었으며, 건물과 TLCD의 거동을 계측하기 위하여 풍향풍속계, 가속도계, 수위계및 인터넷기반 송수신시스템을 구축하였다. 계측된 건물의 가속도와 TLCD 액체의 변위결과를 바탕으로 구조물-TLCD 연계 모드를 식별하였으며 이를 바탕으로 구조물과 TLCD의 고유진동수를 식별하였다. 또한 계측된 구조물과 TLCD의 가속도응답으로부터 칼만필터를 이용하여 모달풍하중을 역추정하여 식별된 구조물의 동특성을 바탕으로 TLCD의 풍진동 저감성능을 분석하였다. 분석결과 TLCD의 설치로 인하여 태풍에 의한 풍진동이 최대 29.9% 정도 저감되는 것으로 나타났다.

본 연구에서는 성과주의 평가보상제도인 목표관리제와 연봉제의 도입 및 실행과정에서 나타나는 디커플링 현상에 대해 이론적으로 고찰한 후 그 선행변수와 결과변수에 대하여 연구가설을 설정하고 실증적으로 검증하였다.디커플링 현상이란 도입취지와 실행 간에 나타나는 분리(decoupling)현상으로 보고 성과주의 평가보상제도에서 나타나는 세 가지의 디커플링 현상을 연구대상으로 하였다.첫째,목표관리제의 도입취지 및 정책과 실행의 디커플링,연봉제의 도입취지 및 정책과 실행의 디커플링,셋째,목표관리제와 연봉제 사이의 연계의 디커플링이다.이론적 검토를 통하여 디커플링 현상의 선행변수로,최고경영자의 지원,조직의 구조적 관성,제도적 동형화 요인을 도출하였으며 결과변수는 재무적,비재무적 성과로 나누어 조사하였다.실증연구 결과는 다음과 같다.최고경영자의 인식과 구조적 관성 변수는 목표관리제의 디커플링,목표관리제와 연봉제 간의 디커플링 정도를 낮추는 것으로 나타났으며,제도적 동형화 요인은 목표관리제의 디커플링 정도,연봉제의 디커플링 정도,목표관리제와 연봉제 간의 디커플링 정도를 모두 낮추는 효과를 가짐을 알 수 있다.또한 목표관리제의 디커플링 정도가 낮을수록 재무적,비재무적 성과가 높아지고,연봉제의 디커플링 정도와 목표관리제-연봉제 간의 디커플링 정도는 비재무적 성과와 정(+)의 유의한 관계에 있는 것으로 나타났다.이상의 결과를 바탕으로 연구의 시사점,한계점 및 향후 연구과제에 대하여 제시하였다.

본 연구는 외환위기 이후 급속히 확산되고 있는 한국 기업들의 성과주의 보상제도(연봉제와 성과배분제 중심)가 초래하고 있는 문제점들을 진단해 보고 개선방안을 제시하는데 목적이 있다. 성과주의 보상제도는 성과와 보상을 직접 연계함으로써 근로자들에게 동기부여를 통해 생산성 향상에 기여하고 복잡한 임금체계의 단순화와 성과 지향적 조직문화 확립에 상당한 효과를 보였으나, 단기적 재무성과와 비용절감 위주의 현안에 초점을 두어 장기적 관점의 인적자원 개발에 소홀하였

본 연구는 마이크로 스케일의 내부 구조를 갖는 3차원 인공지지체를 제작하기 위하여 개발된 제조 시스템의 성능 분석을 위해 x-y축 정밀 스테이지 시스템으로 조립되었을 때의 해상도 및 정확도를 측정 하였으며, z축 정밀 스테이지를 분리하여 다양한 물리적 오차를 제거하였다. 기존의 x-y-z축 정밀 스테이 지 시스템을 x-y축으로 분리하고 각 축의 이동거리를 4종류(±0.25μm, ±0.5μm, ±25μm, ±50μm)로 설정하여 각 위치마다의 변위를 레이저 측정기를 이용하여 기록하였다. 가장 작은 이동거리(±0.25μm)에서의 진동이 상대적으로 가장 크게 나타났으며, y축 스테이지 위에 x축 스테이지를 조립하였기 때문에 x축 스테이지 자중에 의한 모멘텀으로 인하여 y축 스테이지 구동변위 값이 크게 나타났다. 하지만 z축 스테이지는 기존 시스템과 달리 별로도 분리하여 구동 오차를 줄였으며, 일체화된 광학시스템을 적용하여 광학오차를 감 소시켰다. 따라서 새로운 시스템에서는 500μW, 140mm/min의 가공조건에서도 마이크로 스케일의 3차원 인 공지지체 형상의 구조물을 성공적으로 제작할 수 있었다.